Download images from reddit by keyword/subreddit/time/limit

pics_dl.py

import re, praw, requests
from time import sleep


def my_robot(query, sub='all', time='all', limit=25):

    r = praw.Reddit(...)
    #  Get `limit` no. of posts based on `sub`, `query` and `time`
    posts = [p for p in r.subreddit(sub).search(query, time, limit=limit)]
    #  Compile query pattern for regex search
    pattern = re.compile(r'\b{}\b'.format(query), re.I)
    #  Set header for requests downlaods
    header = {'user-agent': 'python:img-downloader:0.1'}

    def _filter(i):
        exts = i.url.endswith(('jpg', 'jpeg', 'png', 'gif'))
        domains = ("gfycat.com", "another.com")
        domain = any(d in i.url for d in domains)
        word = pattern.search(i.title)
        return exts and not domain and word

    #  Filter for image links
    iposts = filter(_filter, posts)

    #  Download images
    for p in iposts:
        fn = p.url.split('/')[-1]
        try:
            req = requests.get(p.url, headers=header)
            with open(fn, 'wb') as f:
                f.write(req.content)
            #  Insert half-second delay between downloads
            sleep(0.5)
        except Exception as e:
            print("Problem downloading:" + fn)
            print(e)


my_robot("dog", "pics", "week", 20)